TWI675508B - Communication device - Google Patents

Abstract

A communication device includes a first antenna combination, a second antenna combination, and a metal separation surface. The metal separation plane is between the first antenna combination and the second antenna combination. The first antenna combination includes four antenna elements. The second antenna combination includes eight antenna elements. The two antenna elements of the first antenna combination and the four antenna elements of the second antenna combination all have a first polarization direction. The other two antenna elements of the first antenna combination and the other four antenna elements of the second antenna combination all have a second polarization direction. The second polarization direction is different from the first polarization direction.

Description

Communication device

The present invention relates to a communication device, and more particularly to a communication device with high isolation (Omnidirectional).

With the development of mobile communication technology, mobile devices have become more and more common in recent years. Common examples include: portable computers, mobile phones, multimedia players, and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-range wireless communication ranges, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz frequency bands to communicate, and Some cover short-range wireless communication ranges, such as: Wi-Fi, Bluetooth systems use the 2.4GHz, 5.2GHz, and 5.8GHz bands for communication.

A wireless access point is a necessary component to enable mobile devices to access the Internet at high speeds indoors. However, because the indoor environment is full of signal reflections and multipath fading, wireless network base stations must be able to process signals from all directions simultaneously. Therefore, how to design a high isolation (Omnidirectional) communication device in the limited space of a wireless network base station has become a major challenge for designers today.

In a preferred embodiment, the present invention provides a communication device including: a first antenna assembly including: a first antenna element; a second antenna element opposite to the first antenna element; a first Three antenna elements; and a fourth antenna element opposite to the third antenna element; a second antenna combination including: a fifth antenna element; a sixth antenna element adjacent to the fifth antenna element; A seventh antenna element adjacent to the sixth antenna element and relative to the fifth antenna element; an eighth antenna element adjacent to the fifth antenna element and the seventh antenna element and relative to the sixth antenna element An antenna element; a ninth antenna element; a tenth antenna element; an eleventh antenna element with respect to the ninth antenna element; and a twelfth antenna element with respect to the tenth antenna element, The fifth antenna element, the sixth antenna element, the seventh antenna element, and the eighth antenna element are connected to the ninth antenna element, the tenth antenna element, the eleventh antenna element, and The twelfth antenna element is staggered; and A metal separation plane between the first antenna combination and the second antenna combination; wherein the first antenna element, the second antenna element, the fifth antenna element, the sixth antenna element, the The seventh antenna element and the eighth antenna element each have a first polarization direction; the third antenna element, the fourth antenna element, the ninth antenna element, the tenth antenna element, and the tenth antenna element. An antenna element and the twelfth antenna element each have a second polarization direction; wherein the second polarization direction is different from the first polarization direction.

In some embodiments, the second polarization direction is perpendicular to the first polarization direction.

In some embodiments, the first polarization direction is parallel to the metal separation plane, and the second polarization direction is perpendicular to the metal separation plane.

In some embodiments, the first antenna combination covers a first frequency band between 2400 MHz and 2500 MHz and a second frequency band between 5150 MHz and 5850 MHz.

In some embodiments, the second antenna combination covers a second frequency band between 5150 MHz and 5850 MHz.

In some embodiments, the first antenna element and the second antenna element are staggered with the third antenna element and the fourth antenna element.

In some embodiments, the length of the metal separation plane is greater than or equal to 0.5 times the wavelength of the lowest frequency of the first frequency band.

In some embodiments, the distance between the first antenna element and the second antenna element is greater than or equal to 0.125 times the wavelength of the lowest frequency of the first frequency band.

In some embodiments, the distance between the third antenna element and the fourth antenna element is greater than or equal to 0.25 times the wavelength of the lowest frequency of the first frequency band.

In some embodiments, the distance between the fifth antenna element, the sixth antenna element, the seventh antenna element, and any adjacent two of the eighth antenna element is greater than or equal to 0.125 of the lowest frequency of the second frequency band. Times the wavelength.

In some embodiments, the distance between the ninth antenna element, the tenth antenna element, the eleventh antenna element, and any adjacent two of the twelfth antenna element is greater than or equal to the second frequency band. Wavelength of 0.25 times the lowest frequency.

In some embodiments, the metal separation plane and the first antenna element, the second antenna element, the fifth antenna element, the sixth antenna element, the The distance between each of the seventh antenna element and the eighth antenna element is greater than or equal to a wavelength of 0.125 times the highest frequency of the second frequency band.

In some embodiments, the third antenna element and the fourth antenna element have a first vertical projection on the metal separation surface, the ninth antenna element, the tenth antenna element, the eleventh antenna element, And the twelfth antenna element has a second vertical projection on the metal separation plane, and the second vertical projection is at least partially overlapped with the first vertical projection.

In some embodiments, there is a first distance between the metal separation plane and each of the third antenna element and the fourth antenna element, and the metal separation plane and the ninth antenna element, the tenth There is a second distance between each of the antenna element, the eleventh antenna element, and the twelfth antenna element, and the sum of the first distance and the second distance is greater than or equal to the first distance 1 times the lowest frequency of the second frequency band.

In some embodiments, the third antenna element and the fourth antenna element have a first vertical projection on the metal separation surface, the ninth antenna element, the tenth antenna element, and the eleventh antenna element. And the twelfth antenna element has a second vertical projection on the metal separation plane, and the second vertical projection system does not overlap the first vertical projection at all.

In some embodiments, there is a first distance between the metal separation plane and each of the third antenna element and the fourth antenna element, and the metal separation plane and the ninth antenna element, the tenth There is a second distance between each of the antenna element, the eleventh antenna element, and the twelfth antenna element, and the sum of the first distance and the second distance is greater than or equal to the first distance 0.5 times the lowest frequency of the second frequency band.

In some embodiments, the metal separation mask has one or more slots.

In some embodiments, the length of each slot is equal to 0.25 times the wavelength of the lowest frequency of the second frequency band.

In some embodiments, the communication device further includes a metal reflective surface, wherein the second antenna combination is interposed between the metal separation surface and the metal reflective surface.

700, 800, 850, 900‧‧‧ communication devices

710‧‧‧The first antenna combination

711‧‧‧first antenna element

712‧‧‧Second antenna element

713‧‧‧Third antenna element

714‧‧‧Fourth antenna element

720‧‧‧Second antenna combination

721‧‧‧ fifth antenna element

722‧‧‧sixth antenna element

723‧‧‧seventh antenna element

724‧‧‧eighth antenna element

725‧‧‧9th antenna element

726‧‧‧tenth antenna element

727‧‧‧Eleventh antenna element

728‧‧‧Twelfth antenna element

730, 830‧‧‧ metal partition

851, 852‧‧‧ slot

960‧‧‧ metal reflective surface

100, 200, 300, 620‧‧‧ antenna systems

105‧‧‧ Dielectric substrate

111‧‧‧first transmission line

112‧‧‧Second Transmission Line

113‧‧‧Third transmission line

114‧‧‧ Fourth Transmission Line

120‧‧‧first dipole antenna

130‧‧‧Second Dipole Antenna

140‧‧‧third dipole antenna

150‧‧‧ fourth dipole antenna

160, 260‧‧‧ fifth dipole antenna

170, 270‧‧‧ sixth dipole antenna

180, 280‧‧‧ seventh dipole antenna

190, 290‧‧‧eighth dipole antenna

301‧‧‧first director

302‧‧‧Second guide

303‧‧‧Third guide

304‧‧‧Fourth guide

600‧‧‧Wireless Network Base Station

610‧‧‧shell

630‧‧‧RF circuit

FB1‧‧‧Low-frequency band

FB2‧‧‧High-frequency band

FP‧‧‧feed point

L1, L2, L3, L4, L5, L6‧‧‧ length

D1, D2, D3, D4, D5, D6, D7, D8‧‧‧ pitch

D9‧‧‧First distance

D10‧‧‧Second Distance

X‧‧‧X axis

Y‧‧‧Y axis

Z‧‧‧Z axis

θ‧‧‧ angle

FIG. 1A is a perspective view showing a communication device according to an embodiment of the present invention.

FIG. 1B is a top view of a communication device according to an embodiment of the present invention.

FIG. 1C is a side view showing a communication device according to an embodiment of the present invention.

FIG. 2A is a top view of a communication device according to an embodiment of the present invention.

FIG. 2B is a top view of a communication device according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a communication device according to an embodiment of the present invention.

FIG. 4A shows a complete schematic diagram of an antenna system according to an embodiment of the present invention.

FIG. 4B shows the upper layer of the antenna system according to an embodiment of the present invention. Partial schematic.

FIG. 4C is a schematic diagram showing a lower part of an antenna system according to an embodiment of the present invention.

FIG. 5A is a complete schematic diagram showing an antenna system according to an embodiment of the present invention.

FIG. 5B is a schematic diagram showing an upper part of an antenna system according to an embodiment of the present invention.

FIG. 5C is a schematic diagram showing a lower part of an antenna system according to an embodiment of the present invention.

FIG. 6A is a complete schematic diagram showing an antenna system according to an embodiment of the present invention.

FIG. 6B is a schematic diagram showing an upper part of an antenna system according to an embodiment of the present invention.

FIG. 6C is a schematic diagram showing a lower part of an antenna system according to an embodiment of the present invention.

FIG. 7 is a graph showing a voltage standing wave ratio of an antenna system according to an embodiment of the present invention.

FIG. 8A is a radiation pattern diagram of an antenna system in a low frequency band according to an embodiment of the present invention.

FIG. 8B is a diagram illustrating a radiation field pattern of an antenna system in a high frequency band according to an embodiment of the present invention.

FIG. 9 is a schematic diagram showing a wireless network base station according to an embodiment of the present invention.

In order to make the objects, features, and advantages of the present invention more comprehensible, specific embodiments of the present invention are specifically listed below, and described in detail with the accompanying drawings.

Certain terms are used in the description and the scope of patent applications to refer to specific elements. Those skilled in the art will understand that hardware manufacturers may use different terms to refer to the same component. The scope of this specification and the patent application does not use the difference in names as a way to distinguish components, but rather uses the difference in functions of components as a criterion for distinguishing components. The terms "including" and "including" mentioned throughout the specification and the scope of patent applications are open-ended terms and should be interpreted as "including but not limited to." The term "approximately" means that within the acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the term "coupled" includes any direct and indirect electrical connection means in this specification. Therefore, if a first device is described as being coupled to a second device, it means that the first device can be electrically connected directly to the second device, or indirectly electrically connected to the first device via other devices or connection means.二 装置。 Two devices.

FIG. 1A is a perspective view showing a communication device 700 according to an embodiment of the present invention. FIG. 1B is a top view of a communication device 700 according to an embodiment of the present invention. FIG. 1C is a side view of a communication device 700 according to an embodiment of the present invention. Please refer to Figures 1A, 1B and 1C together. The communication device 700 can be applied to a wireless access point. In the embodiments shown in FIGS. 1A, 1B, and 1C, the communication device 700 includes a first antenna combination 710, a second antenna combination 720, and a metal separation surface 730. The metal separation surface 730 is interposed between the first Antenna combination 710 and second antenna combination 720, and is used to completely separate the first antenna combination 710 and the second antenna combination 720. For example, the first antenna combination 710 may be located above the metal separation surface 730, and the second antenna combination 720 may be located below the metal separation surface 730, but is not limited thereto. The metal separation surface 730 may have any shape, such as: a square, a circle, a triangle, an ellipse, a trapezoid, a rectangle, or an irregular shape.

The first antenna assembly 710 includes a first antenna element 711, a second antenna element 712, a third antenna element 713, and a fourth antenna element 714. The second antenna combination 720 includes a fifth antenna element 721, a sixth antenna element 722, a seventh antenna element 723, an eighth antenna element 724, a ninth antenna element 725, and a tenth antenna element 726 , An eleventh antenna element 727, and a twelfth antenna element 728. The shape and kind of the aforementioned antenna element are not particularly limited in the present invention. For example, any one of the aforementioned antenna elements may be a monopole antenna, a dipole antenna, a helical antenna, a patch antenna, or a loop antenna. A loop antenna or a chip antenna is not limited to this.

The first antenna element 711, the second antenna element 712, the fifth antenna element 721, the sixth antenna element 722, the seventh antenna element 723, and the eighth antenna element 724 all have a first polarization direction. ), And the third antenna element 713, the fourth antenna element 714, the ninth antenna element 725, the tenth antenna element 726, the eleventh antenna element 727, and the twelfth antenna element 728 all have a second pole Direction, wherein the second polarization direction is different from the first polarization direction. In some embodiments, the second polarization direction and the first polarization direction are mutually vertical. For example, the first polarization direction may be a horizontal polarization direction, which is parallel to the metal separation plane 730 (or parallel to the XY plane), and the second polarization direction may be a vertical polarization direction, which is perpendicular to the metal The separation plane 730 (or parallel to the Z axis).

In the first antenna combination 710, the first antenna element 711 and the second antenna element 712 may be staggered with the third antenna element 713 and the fourth antenna element 714. In the second antenna combination 720, the fifth antenna element 721, the sixth antenna element 722, the seventh antenna element 723, and the eighth antenna element 724 may be combined with the ninth antenna element 725, the tenth antenna element 726, the The eleven antenna elements 727 and the twelfth antenna element 728 are staggered. That is, whether it is the first antenna combination 710 or the second antenna combination 720, any antenna element having a first polarization direction may be interposed between two antenna elements having a second polarization direction, and Any antenna element having a second polarization direction may be interposed between two antenna elements having a first polarization direction. This design can improve the isolation between adjacent antenna elements, and at the same time enhance the Antenna Polarization Diversity of the communication device 700.

In some embodiments, the first antenna element 711, the second antenna element 712, the fifth antenna element 721, the sixth antenna element 722, the seventh antenna element 723, and the eighth antenna element 724, the ninth antenna The element 725, the tenth antenna element 726, the eleventh antenna element 727, and the twelfth antenna element 728 are all printed circuit board (PCB) antennas, which are supported by a plastic supporting element (not shown) It is fixed on the metal separation surface 730. In some embodiments, the third antenna element 713 and the fourth antenna element 714 are both ironware antennas, which are directly locked and fixed on the metal separation surface 730. In detail, the third antenna element 713 and the fourth antenna element 714 have a first vertical portion on the metal separation surface 730. Vertical Projection, and the ninth antenna element 725, the tenth antenna element 726, the eleventh antenna element 727, and the twelfth antenna element 728 have a second vertical projection on the metal separation plane 730, The second vertical projection may at least partially overlap the first vertical projection. For example, the vertical projection of the third antenna element 713 may at least partially overlap the vertical projection of the twelfth antenna element 728, and the vertical projection of the fourth antenna element 714 may at least partially overlap the vertical projection of the tenth antenna element 726 , But it is not limited to this.

In some embodiments, each antenna element of the first antenna combination 710 may cover a first frequency band between 2400 MHz and 2500 MHz, and a second frequency band between 5150 MHz and 5850 MHz. In addition, each antenna element of the second antenna combination 720 may cover a second frequency band between 5150 MHz and 5850 MHz. Therefore, the communication device 700 can support at least dual-band operation of WLAN (Wireless Local Area Network) 2.4GHz / 5GHz. According to the actual measurement results, the isolation between the first antenna combination 710 and the second antenna combination 720 can reach more than 40dB in the aforementioned second frequency band, in which any two adjacent antenna elements in the same antenna combination The isolation between them can reach more than 20dB. In addition, both the first antenna combination 710 and the second antenna combination 720 may have an approximately omnidirectional radiation pattern. The above performance parameters can meet the practical application requirements of general mobile communication.

In some embodiments, the component dimensions of the communication device 700 are as follows. The length L5 of the metal partition surface 730 (for example, the length of each side of the square metal partition surface 730) may be greater than or equal to 0.5 times the wavelength (λ / 2) of the lowest frequency of the aforementioned first frequency band. The distance D3 between the first antenna element 711 and the second antenna element 712 may be greater than or equal to 0.125 times the wavelength of the lowest frequency of the aforementioned first frequency band. (λ / 8). The distance D4 between the third antenna element 713 and the fourth antenna element 714 may be greater than or equal to 0.25 times the wavelength (λ / 4) of the lowest frequency of the aforementioned first frequency band. The distance D5 between any of the fifth antenna element 721, the sixth antenna element 722, the seventh antenna element 723, and the eighth antenna element 724 may be greater than or equal to 0.125 times the wavelength of the lowest frequency of the aforementioned second frequency band (λ /8). The distance D6 between the ninth antenna element 725, the tenth antenna element 726, the eleventh antenna element 727, and the twelfth antenna element 728 may be greater than or equal to 0.25 of the lowest frequency of the aforementioned second frequency band Double wavelength (λ / 4). The distance D7 between the metal separation surface 730 and each of the first antenna element 711 and the second antenna element 712 may be greater than or equal to 0.125 times the wavelength (λ / 8) of the highest frequency of the aforementioned second frequency band. The distance D8 between the metal separating surface 730 and each of the fifth antenna element 721, the sixth antenna element 722, the seventh antenna element 723, and the eighth antenna element 724 may be greater than or equal to the highest frequency of the second frequency band. 0.125 times the wavelength (λ / 8). There is a first distance D9 between the metal partition surface 730 and each of the third antenna element 713 and the fourth antenna element 714, and the metal partition surface 730 and the ninth antenna element 725, the tenth antenna element 726, the first Each of the eleventh antenna element 727 and the twelfth antenna element 728 has a second distance D10, wherein the sum of the first distance D9 and the second distance D10 may be greater than or equal to the aforementioned second frequency band. Wavelength (λ) of the lowest frequency. The ranges of the above dimensions and distances are obtained based on the results of multiple experiments, which help to optimize the isolation and radiation pattern of the communication device 700.

FIG. 2A is a top view of a communication device 800 according to an embodiment of the present invention. Figure 2A is similar to Figure 1B. In the embodiment of FIG. 2A, the second antenna assembly 720 is slightly rotated along the center point of the communication device 800. In detail, the third antenna element 713 and the fourth antenna element 714 are on the metal separation surface 730 Has a first vertical projection, and the ninth antenna element 725, the tenth antenna element 726, the eleventh antenna element 727, and the twelfth antenna element 728 have a second vertical projection on the metal separation plane 730, The second vertical projection system does not overlap the first vertical projection at all. According to actual measurement results, this staggered design can reduce mutual interference between the first antenna combination 710 and the second antenna combination 720 in the second polarization direction, thereby further reducing the size of the communication device 800 ( (Specifically refers to the height on the Z axis). Please refer to Figure 1C again. There is a first distance D9 between the metal partition surface 730 and each of the third antenna element 713 and the fourth antenna element 714, and the metal partition surface 730 and the ninth antenna element 725, the tenth antenna element 726, the first Each of the eleven antenna elements 727 and the twelfth antenna element 728 has a second distance D10. If the staggered design of FIG. 2A is used, the sum of the first distance D9 and the second distance D10 can be only greater than or equal to 0.5 times the wavelength (λ / 2) of the lowest frequency of the second frequency band of the communication device 800 (more than 50% reduction) ). The remaining features of the communication device 800 in FIG. 2A are similar to those of the communication device 700 in FIGS. 1A, 1B, and 1C. Therefore, the two embodiments can achieve similar operating effects.

FIG. 2B is a top view of a communication device 850 according to an embodiment of the present invention. Figure 2B is similar to Figure 2A. In the embodiment of FIG. 2B, one of the metal separating surfaces 830 of the communication device 850 has one or a plurality of slots 851, 852, and the length L6 of each of the slots 851, 852 is substantially equal to the communication device. 0.25 times the wavelength (λ / 4) of the lowest frequency of the second frequency band of 850. For example, the slot 851 may be between the vertical projection of the third antenna element 713 and the vertical projection of the eleventh antenna element 727, and the slot 852 may be between the vertical projection of the fourth antenna element 714 and the ninth antenna The vertical projection of the element 725 is not limited to this. According to the actual measurement results, this slot design can reduce the first antenna group The mutual interference between the antenna 710 and the second antenna combination 720 in the second polarization direction can further reduce the size of the communication device 850 (especially the height on the Z axis). It must be understood that although FIG. 2B shows exactly two slot holes 851, 852, in other embodiments, the metal separation surface 830 may have more or fewer slot holes according to different needs. The remaining features of the communication device 850 in FIG. 2B are similar to those of the communication device 800 in FIG. 2A, so similar operation effects can be achieved in both embodiments.

FIG. 3 is a perspective view showing a communication device 900 according to an embodiment of the present invention. Figure 3 is similar to Figure 1A. In the embodiment shown in FIG. 3, the communication device 900 further includes a metal reflecting surface 960, which is adjacent to the second antenna combination 720. It must be noted that the term "adjacent" or "adjacent" in this specification may refer to the distance between the corresponding two components being less than a predetermined distance (for example: 10mm or less), and may also include the corresponding two components in direct contact with each other. Case (that is, the aforementioned pitch is shortened to 0). The second antenna combination 720 is interposed between the metal separation surface 730 and the metal reflection surface 960. For example, the metal reflecting surface 960 may be a metal casing of a wireless network base station, but it is not limited thereto. According to actual measurement results, the design of this reflecting surface can reduce mutual interference between the first antenna combination 710 and the second antenna combination 720 in the second polarization direction, thereby further reducing the size of the communication device 900 ( (Specifically refers to the height on the Z axis). The remaining features of the communication device 900 in FIG. 3 are similar to those of the communication device 700 in FIGS. 1A, 1B, and 1C, so the two embodiments can achieve similar operating effects.

The following embodiments will introduce the detailed structure of each antenna element having the first polarization direction. It must be noted that the first antenna element 711, the second antenna element 712, the fifth antenna element 721, the sixth antenna element 722, and the seventh antenna Each of the element 723 and the eighth antenna element 724 can be referred to as an “Antenna System”, and the design patterns of the following antenna systems are merely examples and are not intended to limit the present invention.

FIG. 4A is a complete schematic diagram of an antenna system 100 according to an embodiment of the present invention. The antenna system 100 may be formed on an upper surface and a lower surface of one of the dielectric substrates 105. The dielectric substrate 105 may be a printed circuit board or a FR4 substrate (Flame Retardant 4 Substrate). FIG. 4B is a schematic diagram showing a part of the upper layer of the antenna system 100 according to an embodiment of the present invention, that is, a part of the antenna pattern on the upper surface of the dielectric substrate 105. FIG. 4C is a schematic diagram showing a part of the lower layer of the antenna system 100 according to an embodiment of the present invention, that is, another part of the antenna pattern located on the lower surface of the dielectric substrate 105. Figure 4A is a combination of Figures 4B and 4C. It must be noted that Figure 4B is a top view of Figure 4A, but Figure 4C is a perspective view of the lower antenna pattern of Figure 4A and not its back view (the two will be 180 degrees apart). Please refer to Figures 4A, 4B and 4C together. The antenna system 100 can be used in a wireless network base station. In the embodiments shown in FIGS. 4A, 4B, and 4C, the antenna system 100 includes a first transmission line 111, a second transmission line 112, a third transmission line 113, a fourth transmission line 114, and a first pair. Dipole Antenna 120, a second dipole antenna 130, a third dipole antenna 140, a fourth dipole antenna 150, a fifth dipole antenna 160, a sixth dipole antenna 170, a first A seven dipole antenna 180 and an eighth dipole antenna 190. Each of the aforementioned dipole antennas includes a radiator on the upper surface of the dielectric substrate 105 and another radiator on the lower surface of the dielectric substrate 105. Each transmission line includes a surface above the dielectric substrate 105 And the transmission path of the relative position of the lower surface. The aforementioned radiation systems respectively located on the upper and lower surfaces extend from one end of the corresponding transmission line respectively on the upper and lower surfaces and extend in different directions.

The antenna system 100 has a feeding point (FP), which can be coupled to a radio frequency (RF) module (not shown). The RF module can be used to excite the antenna system 100. First transmission line 111, second transmission line 112, third transmission line 113, fourth transmission line 114, first dipole antenna 120, second dipole antenna 130, third dipole antenna 140, fourth dipole antenna 150, fifth The dipole antenna 160, the sixth dipole antenna 170, the seventh dipole antenna 180, and the eighth dipole antenna 190 can present a point symmetrical distribution pattern with the feeding point FP as the center. In detail, the first transmission line 111, the first dipole antenna 120, and the fifth dipole antenna 160 can be used as a first communication unit; the second transmission line 112, the second dipole antenna 130, and the sixth dipole antenna 170 can be used as a first communication unit. Used as a second communication unit; the third transmission line 113 and the third dipole antenna 140, the seventh dipole antenna 180 can be used as a third communication unit; and the fourth transmission line 114 and the fourth dipole antenna 150, eighth The dipole antenna 190 can be used as a fourth communication unit. The four communication units have exactly the same structure, and the only difference is that they face different directions, so that the antenna system 100 can receive or transmit signals in all directions. In other embodiments, the antenna system 100 may include fewer or more communication units.

Any adjacent two of the first transmission line 111, the second transmission line 112, the third transmission line 113, and the fourth transmission line 114 (for example, the second transmission line 112 and the third transmission line 113, or the first transmission line 111 and the fourth transmission line 114 ) Can be approximately perpendicular to each other, so that a combination of one of the first transmission line 111, the second transmission line 112, the third transmission line 113, and the fourth transmission line 114 can be roughly cross-shaped. (Cross Shape). The first dipole antenna 120 is coupled to the feed point FP via the first transmission line 111, the second dipole antenna 130 is coupled to the feed point FP via the second transmission line 112, and the third dipole antenna 140 is via the third The transmission line 113 is coupled to the feed point FP, and the fourth dipole antenna 150 is coupled to the feed point FP via the fourth transmission line 114. In order to adjust the impedance matching, each of the aforementioned transmission lines may have a structure of unequal width. For example, each transmission line may include a wider portion and a narrower portion, wherein the wider portion may be directly connected to the corresponding one of the aforementioned dipole antennas, and the narrower portion may be directly connected to the feeding point. FP. In other embodiments, the narrower portion may be directly connected to the corresponding one of the aforementioned dipole antennas, and the wider portion may be directly connected to the feeding point FP. In other embodiments, each of the aforementioned transmission lines may be changed to a uniform width structure.

In detail, the first dipole antenna 120, the second dipole antenna 130, the third dipole antenna 140, and the fourth dipole antenna 150 each include a positive radiating branch and a negative radiating branch (respectively disposed on the medium). The upper surface and the lower surface of the substrate 105), wherein an angle θ between one of the positive radiation branch and the negative radiation branch is less than 100 degrees. In some embodiments, the angle θ between the positive radiation branch and the negative radiation branch is approximately equal to 90 degrees, so that the first dipole antenna 120, the second dipole antenna 130, the third dipole antenna 140, and the fourth A combination of one of the dipole antennas 150 forms a first square, in which the first transmission line 111, the second transmission line 112, the third transmission line 113, the fourth transmission line 114, the fifth dipole antenna 160, the sixth dipole antenna 170, the first The seven dipole antenna 180 and the eighth dipole antenna 190 are all surrounded by a first square.

The fifth dipole antenna 160 is coupled to the first transmission line 111 and is interposed between the first dipole antenna 120 and the feeding point FP. The sixth dipole antenna 170 is coupled to the second transmission line 112 and is interposed between the second dipole antenna 130 and the feeding point FP. The seventh dipole antenna 180 is coupled to the third transmission line 113 and is interposed between the third dipole antenna 140 and the feeding point FP. The eighth dipole antenna 190 is coupled to the fourth transmission line 114 and is interposed between the fourth dipole antenna 150 and the feeding point FP. Each of the fifth dipole antenna 160, the sixth dipole antenna 170, the seventh dipole antenna 180, and the eighth dipole antenna 190 may be coupled to the first transmission line 111, the second transmission line 112, and the third The center of the corresponding one of the transmission line 113 and the fourth transmission line 114, that is, the junction between the wider and narrower portions of the corresponding transmission line.

In detail, the fifth dipole antenna 160, the sixth dipole antenna 170, the seventh dipole antenna 180, and the eighth dipole antenna 190 are respectively located on the upper surface and the lower surface. The two radiators are a positive radiation segment and A negative radiating section (on the upper and lower surfaces of the dielectric substrate 105), in some embodiments, the positive radiating section and the negative radiating section are substantially parallel to each other and extend in opposite directions, so that the fifth dipole antenna A combination of 160, the sixth dipole antenna 170, the seventh dipole antenna 180, and the eighth dipole antenna 190 forms a second square, where the area of the second square is smaller than that of the first dipole antenna 120, the first The area of the first square formed by the dipole antenna 130, the third dipole antenna 140, and the fourth dipole antenna 150, and the second square is surrounded by the first square. The feeding point FP is located at the center of a second square formed by the fifth dipole antenna 160, the sixth dipole antenna 170, the seventh dipole antenna 180, and the eighth dipole antenna 190.

In terms of antenna principles, each of the first dipole antenna 120, the second dipole antenna 130, the third dipole antenna 140, and the fourth dipole antenna 150 may cover a low-frequency band; in addition, the fifth dipole Each of the antenna 160, the sixth dipole antenna 170, the seventh dipole antenna 180, and the eighth dipole antenna 190 may cover a high-frequency band. For example, the aforementioned low frequency band may be between 2400MHz and 2500MHz, and the aforementioned high frequency band may be between 5150MHz and 5850MHz.

By appropriately designing the branches of each dipole antenna of the antenna system 100, the overall size of the antenna system 100 can be effectively reduced. Compared with the traditional Alford Loop Antenna, the antenna system 100 can reduce the total area by about 30% to 40% without affecting its operating frequency band and radiation efficiency. Therefore, the antenna system 100 can have multiple advantages such as small size, wide frequency band, omnidirectionality, and high antenna efficiency.

FIG. 5A is a complete schematic diagram showing an antenna system 200 according to an embodiment of the present invention. FIG. 5B is a schematic diagram showing an upper part of the antenna system 200 according to an embodiment of the present invention. FIG. 5C is a schematic diagram showing a lower part of the antenna system 200 according to an embodiment of the present invention. Figures 5A, 5B, and 5C are similar to Figures 4A, 4B, and 4C. In the embodiment shown in FIGS. 5A, 5B, and 5C, one of the fifth dipole antenna 260, a sixth dipole antenna 270, a seventh dipole antenna 280, and an eighth dipole antenna 290 of the antenna system 200 has Different extension directions. In detail, the fifth dipole antenna 260, the sixth dipole antenna 270, the seventh dipole antenna 280, and the eighth dipole antenna 290 each include a positive radiation segment and a negative radiation segment (respectively disposed on the dielectric substrate 105). (Upper and lower surfaces), where the positive and negative radiation segments are approximately perpendicular to each other and extend away from the corresponding transmission line, so that the fifth dipole antenna 260, the sixth dipole antenna 270, and the seventh dipole The antenna 280 and one of the eighth dipole antenna 290 form a second square, and the area of the second square is smaller than that of the first dipole antenna 120, the second dipole antenna 130, and the third dipole antenna 140. And the area of the first square formed by the fourth dipole antenna 150, and the second square is formed by the first square around. The feed point FP is located at the center of a second square formed by the fifth dipole antenna 260, the sixth dipole antenna 270, the seventh dipole antenna 280, and the eighth dipole antenna 290. The configuration of the fifth dipole antenna 260, the sixth dipole antenna 270, the seventh dipole antenna 280, and the eighth dipole antenna 290 can be used to adjust the polarization direction of the high-frequency band of the antenna system 200. It does not increase the overall area of the antenna system 200. The remaining features of the antenna system 200 shown in FIGS. 5A, 5B, and 5C are similar to the antenna system 100 shown in FIGS. 4A, 4B, and 4C. Therefore, the two embodiments can achieve similar operating effects.

FIG. 6A is a complete schematic diagram showing an antenna system 300 according to an embodiment of the present invention. FIG. 6B is a schematic diagram showing a part of the upper layer of the antenna system 300 according to an embodiment of the present invention. FIG. 6C is a schematic diagram showing a lower part of the antenna system 300 according to an embodiment of the present invention. Figures 6A, 6B, and 6C are similar to Figures 4A, 4B, and 4C. In the embodiments shown in FIGS. 6A, 6B, and 6C, the antenna system 300 further includes a first director 301, a second director 302, a third director 303, and a fourth director 304. The first director 301 is coupled to the first transmission line 111 and is interposed between the first dipole antenna 120 and the fifth dipole antenna 160. The second director 302 is coupled to the second transmission line 112 and is interposed between the second dipole antenna 130 and the sixth dipole antenna 170. The third director 303 is coupled to the third transmission line 113 and is interposed between the third dipole antenna 140 and the seventh dipole antenna 180. The fourth director 304 is coupled to the fourth transmission line 114 and is interposed between the fourth dipole antenna 150 and the eighth dipole antenna 190. In detail, the first guide 301, the second guide 302, the third guide 303, and the fourth guide 304 each include a positive extension branch and a negative extension branch (both are disposed on the dielectric substrate 105 at the same time) The upper surface, or at the same time under the dielectric substrate 105 Surface), and the positive extension branch and the negative extension branch are substantially parallel to each other and extend in opposite directions. Each of the first guide 301, the second guide 302, the third guide 303, and the fourth guide 304 may be substantially the same as the fifth dipole antenna 160, the sixth dipole antenna 170, and the seventh dipole antenna. A corresponding one of 180 and the eighth dipole antenna 190 is parallel to each other. The first director 301, the second director 302, the third director 303, and the fourth director 304 can guide high-frequency radiation outward, which helps to enhance the radiation field pattern of the high-frequency band of the antenna system 300 Without increasing the overall area of the antenna system 300. The remaining features of the antenna system 300 shown in FIGS. 6A, 6B, and 6C are similar to the antenna system 100 shown in FIGS. 4A, 4B, and 4C. Therefore, the two embodiments can achieve similar operating effects.

FIG. 7 is a voltage standing wave ratio (VSWR) diagram of the antenna system 300 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the voltage standing wave ratio . According to the measurement results in FIG. 7, the antenna system 300 can cover at least a low-frequency band FB1 between 2400MHz and 2500MHz and a high-frequency band FB2 between 5150MHz and 5850MHz, so that the antenna system 300 can at least Support dual-band operation of WLAN 2.4GHz / 5GHz.

FIG. 8A shows a radiation pattern of the antenna system 300 in the low-frequency band FB1 according to an embodiment of the present invention, which is measured along the XY plane. FIG. 8B shows a radiation pattern of the antenna system 300 in the high-frequency band FB2 according to an embodiment of the present invention, which is also measured along the XY plane. According to the measurement results in Figures 8A and 8B, it can be seen that the antenna system 300 can be regarded as an improved version of the Alford loop antenna. Before reducing the overall size, it can also be approximated in the required high and low frequency bands. Omnidirectional Radiation field type to meet the needs of practical applications.

In some embodiments, the total length L1 of each of the first dipole antenna 120, the second dipole antenna 130, the third dipole antenna 140, and the fourth dipole antenna 150 may be approximately equal to 0.5 of the low-frequency band FB1. Double wavelength (λ / 2). The total length of each of the fifth dipole antenna 160 (or 260), the sixth dipole antenna 170 (or 270), the seventh dipole antenna 180 (or 280), and the eighth dipole antenna 190 (or 290) The degree L2 may be approximately equal to 0.5 times the wavelength (λ / 2) of the high-frequency band FB2. In some embodiments, the element sizes of the antenna systems 100, 200, and 300 can be estimated according to the following equations (1) to (6).

The units of parameter A and parameter B are both millimeters (mm). The center frequency of the low frequency band FB1 is set to α GHz, the center frequency of the high frequency band FB2 is set to β GHz, and the dielectric constant of the dielectric substrate 105 (Dielectric Constant) is set to C.

0.6. A < L 1 <1.4. A ......... (3) where L1 stands for The total length of each of a dipole antenna 120, a second dipole antenna 130, a third dipole antenna 140, and a fourth dipole antenna 150.

0.6. B < L 2 <1.4. B ................. (4) where L2 stands for The total length of each of the five dipole antennas 160 (or 260), the sixth dipole antenna 170 (or 270), the seventh dipole antenna 180 (or 280), and the eighth dipole antenna 190 (or 290) .

0.3. A < L 3 <0.7. A ......... (5) where L3 stands for A length of an orthographic projection of each of a transmission line 111, a second transmission line 112, a third transmission line 113, and a fourth transmission line 114.

0.3. B < D 1 <0.7. B ................................... (6) where D1 stands for Each of the five dipole antenna 160 (or 260), the sixth dipole antenna 170 (or 270), the seventh dipole antenna 180 (or 280), and the eighth dipole antenna 190 (or 290) and the feed Distance between points FP.

In some embodiments, each of the first director 301, the second director 302, the third director 303, and the fourth director 304 and the fifth dipole antenna 160, the sixth dipole antenna 170, The distance D2 between the corresponding one of the seventh dipole antenna 180 and the eighth dipole antenna 190 may be substantially equal to the aforementioned distance D1, and the calculation method thereof may be as described in equation (6). In other embodiments, the total length L4 of each of the first guide 301, the second guide 302, the third guide 303, and the fourth guide 304 may be approximately the fifth dipole antenna 160, the first The total length L2 of each of the six dipole antenna 170, the seventh dipole antenna 180, and the eighth dipole antenna 190 is between 0.4 and 1.1 times the length L2 (that is, 0.4. L2 < L 4 <1.1. L2 ), Which can be calculated as described in equation (4). It should be noted that the component size range estimated above based on equations (1) to (6) is obtained based on multiple experimental results, which can be used to optimize the operating frequency band and impedance matching of antenna systems 100, 200, and 300. .

FIG. 9 is a schematic diagram showing a wireless network base station 600 according to an embodiment of the present invention. In the embodiment of FIG. 9, the wireless network base station 600 includes a casing 610, an antenna system 620, and a radio frequency circuit 630. The housing 610 may be a hollow structure having any shape. The antenna system 620 and the radio frequency circuit 630 may be disposed in the casing 610, and the antenna system 620 is electrically connected to the radio frequency circuit 630. It must be noted that the antenna system 620 may be any one of the foregoing antenna systems 100, 200, and 300, and its functions and structures are as described in the previous embodiment.

The present invention proposes a novel communication device, which has at least the following advantages compared with the traditional technology: (1) covers a wider frequency band; (2) provides a radiation field type that is approximately omnidirectional; (3) effectively reduces the overall antenna Size; (4) improve the isolation between antenna elements; (5) simple structure and easy mass production; (6) can reduce the overall manufacturing cost; and (7) can be used in various environments without further correction. Therefore, the present invention is very suitable for various multi-band communication devices or wireless network base stations.

It is worth noting that the above-mentioned component size, component shape, and frequency range are not the limiting conditions of the present invention. The antenna designer can adjust these settings according to different needs. The communication device of the present invention is not limited to the state shown in FIGS. 1-9. The invention may include only any one or more of the features of any one or more of the embodiments of Figures 1-9. In other words, not all the illustrated features must be implemented in the communication device of the present invention at the same time.

The ordinal numbers in this specification and the scope of patent application, such as "first", "second", "third", etc., do not have a sequential relationship with each other, they are only used to indicate that two have the same Different components of the name.

Although the present invention is disclosed as above with a preferred embodiment, it is not intended to limit the scope of the present invention. Any person skilled in the art can make some modifications and decorations without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims (19)

A communication device includes: a first antenna combination, including: a first antenna element; a second antenna element relative to the first antenna element; a third antenna element; and a fourth antenna element , Relative to the third antenna element; a second antenna combination, including: a fifth antenna element; a sixth antenna element, adjacent to the fifth antenna element; a seventh antenna element, adjacent to the A sixth antenna element relative to the fifth antenna element; an eighth antenna element adjacent to the fifth antenna element and the seventh antenna element and relative to the sixth antenna element; a ninth antenna element; A tenth antenna element; an eleventh antenna element, relative to the ninth antenna element; and a twelfth antenna element, relative to the tenth antenna element, wherein the fifth antenna element, the sixth The antenna element, the seventh antenna element, and the eighth antenna element are staggered with the ninth antenna element, the tenth antenna element, the eleventh antenna element, and the twelfth antenna element; And a metal divider between the first day Between the combination and the second antenna combination; wherein the first antenna element, the second antenna element, the fifth antenna element, the sixth antenna element, the seventh antenna element, and the eighth antenna The elements all have a first polarization direction; wherein the third antenna element, the fourth antenna element, the ninth antenna element, the tenth antenna element, the eleventh antenna element, and the twelfth day The line elements all have a second polarization direction; wherein the second polarization direction is different from the first polarization direction. The communication device as described in item 1 of the patent application scope, wherein the second polarization direction is perpendicular to the first polarization direction. The communication device as described in item 1 of the patent application range, wherein the first polarization direction is parallel to the metal separation plane, and the second polarization direction is perpendicular to the metal separation plane. The communication device according to item 1 of the patent application scope, wherein the first antenna combination covers a first frequency band between 2400 MHz and 2500 MHz, and a second frequency band between 5150 MHz and 5850 MHz. The communication device according to item 1 of the patent application scope, wherein the second antenna combination covers a second frequency band between 5150 MHz and 5850 MHz. The communication device as described in item 1 of the patent application scope, wherein the first antenna element and the second antenna element are staggered with the third antenna element and the fourth antenna element. The communication device as described in item 4 of the patent application scope, wherein the length of the metal separation plane is greater than or equal to 0.5 times the wavelength of the lowest frequency of the first frequency band. The communication device as described in item 4 of the patent application range, wherein the distance between the first antenna element and the second antenna element is greater than or equal to 0.125 times the wavelength of the lowest frequency of the first frequency band. The communication device as described in item 4 of the patent application range, wherein the distance between the third antenna element and the fourth antenna element is greater than or equal to 0.25 times the wavelength of the lowest frequency of the first frequency band. The communication device as described in item 4 of the patent application scope, wherein the distance between any two of the fifth antenna element, the sixth antenna element, the seventh antenna element, and the eighth antenna element is greater than or equal to the 0.125 times the wavelength of the lowest frequency of the second frequency band. The communication device as described in item 4 of the patent application scope, wherein the distance between any adjacent two of the ninth antenna element, the tenth antenna element, the eleventh antenna element, and the twelfth antenna element is It is greater than or equal to 0.25 times the wavelength of the lowest frequency of the second frequency band. The communication device as described in item 4 of the patent application scope, wherein the metal separating surface and the first antenna element, the second antenna element, the fifth antenna element, the sixth antenna element, the seventh antenna The distance between each of the element and the eighth antenna element is greater than or equal to 0.125 times the wavelength of the highest frequency of the second frequency band. The communication device as described in item 4 of the patent application scope, wherein the third antenna element and the fourth antenna element have a first vertical projection, the ninth antenna element, the tenth antenna element on the metal separation surface The eleventh antenna element and the twelfth antenna element have a second vertical projection on the metal separation surface, and the second vertical projection at least partially overlaps with the first vertical projection. The communication device as described in item 13 of the patent application range, wherein the metal separation surface has a first distance between each of the third antenna element and the fourth antenna element, and the metal separation surface is Each of the nine antenna elements, the tenth antenna element, the eleventh antenna element, and the twelfth antenna element has a second distance, and the first distance and the second distance The sum is greater than or equal to 1 wavelength of the lowest frequency of the second frequency band. The communication device as described in item 4 of the patent application scope, wherein the third antenna element and the fourth antenna element have a first vertical projection, the ninth antenna element, the tenth antenna element on the metal separation surface The eleventh antenna element and the twelfth antenna element have a second vertical projection on the metal separation surface, and the second vertical projection does not overlap with the first vertical projection at all. The communication device as described in item 15 of the patent application range, wherein the metal separation surface has a first distance between each of the third antenna element and the fourth antenna element, and the metal separation surface is Each of the nine antenna elements, the tenth antenna element, the eleventh antenna element, and the twelfth antenna element has a second distance, and the first distance and the second distance The sum is greater than or equal to 0.5 times the wavelength of the lowest frequency of the second frequency band. The communication device as described in item 15 of the patent application scope, wherein the metal separator has one or more slots. The communication device as described in Item 17 of the patent application, wherein the length of each of these slots is equal to 0.25 times the wavelength of the lowest frequency of the second frequency band. The communication device as described in item 1 of the patent application scope further includes: a metal reflective surface, wherein the second antenna assembly is interposed between the metal separating surface and the metal reflective surface.